Question: When can I start killing crabgrass in spring, and with what herbicide?
Answer: Crabgrass generally appears in lawns in late May, so earlier in the spring is the time for applying herbicides. You'll want to use pre-emergent herbicides, specifically. May 1 is the approximate time for application of a pre-emergent herbicide to control crabgrass in many regions of the northern U.S. and Canada, but the ideal time will vary depending on where you live and how warm a spring you're having. In the South, you'll need to apply crabgrass preventer earlier.
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